Atmel Corporation

Hammad Syed

Grahame K Reynolds

Samuel Daniel Brunet

In certain embodiments, a method includes performing a first positive integration by sensing a first rising edge of a charging signal of a touch sensor during a first synchronization period and performing a first negative integration by sensing a first falling edge of the charging signal during a second synchronization period. The method also includes toggling the charging signal, resulting in a second rising edge of the charging signal during the second synchronization period. The method further includes performing a second negative integration by sensing a second falling edge of the charging signal during a third synchronization period and performing a second positive integration by sensing a third rising edge of the charging signal during a fourth synchronization period. The first integrations are associated with a first sample measurement and the second integrations are associated with a second sample measurement.

Touch sensor signal integration

In certain embodiments, a method includes performing a first positive integration by sensing a first rising edge of a charging signal of a touch sensor during a first synchronization period, performing a first negative integration by sensing a first falling edge of the charging signal during a second synchronization period, and performing a first phase shift by skipping integration during a third synchronization period. The method further includes performing a second positive integration by sensing a second rising edge of the charging signal during a fourth synchronization period, performing a second negative integration by sensing a second falling edge of the charging signal during a fifth synchronization period, and performing a second phase shift by skipping integration during a sixth synchronization period. The first integrations are associated with a first sample measurement and the second integrations are associated with a second sample measurement.

In certain embodiments, a touch sensor controller estimates an area of a display screen that a display controller will update at a first time and estimates an area of a touch sensor that the touch sensor controller is expected to scan at the first time. The touch sensor controller further identifies an expected interference based on a comparison between the update of the estimated area of the display screen by the display controller at the first time and the scan of the estimated area of the touch sensor by the touch sensor controller at the first time. Based on the expected interference, the touch sensor controller suspends, for a first time period, the scan of the estimated area of the touch sensor for touch events based on the expected interference. The touch sensor controller resumes the scan after the first time period.

Suspension of touch sensor scan based on an expected interference

In certain embodiments, a touch sensor controller suspends a scan of a touch sensitive area of a touch sensor for touch events based on an expected interference between the scan and an update of a display screen. After the first time period, touch sensor controller resumes the scan.

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Slough, United Kingdom

Hammad Syed